add release note

diff --git a/doc/build/changelog/unreleased_14/7259.rst b/doc/build/changelog/unreleased_14/7259.rst
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+.. change::
+    :tags: sql
+    :tickets: 7259
+
+    Render Non-linear CTE with :meth:`_sql.CTE.union` and :meth:`_sql.CTE.union_all`
+    that accept multiple clauses to render multiple UNIONs. To make it possible,
+    :meth:`_sql.Select.union` and :meth:`_sql.Select.union_all` accept also multiple
+    clauses.